From 7c30f5c9959a4db9b22f246384331b67590e9046 Mon Sep 17 00:00:00 2001
From: Tamilselvi <85762097+tamilselvi53@users.noreply.github.com>
Date: Fri, 28 Oct 2022 10:22:58 +0530
Subject: [PATCH] added counting sort

---
 Sorting Algorithms/CountingSort.java | 30 ++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 Sorting Algorithms/CountingSort.java

diff --git a/Sorting Algorithms/CountingSort.java b/Sorting Algorithms/CountingSort.java
new file mode 100644
index 0000000..9eae6e9
--- /dev/null
+++ b/Sorting Algorithms/CountingSort.java	
@@ -0,0 +1,30 @@
+//T(n): O(n* range) approx O(n)
+//S(n): O(n * r)
+public class Main
+{
+    public static int[] CountSort(int[] arr, int n) {
+        int[] freq = new int[10];
+        //Freuency of numbers
+        for (int i = 0; i < n; i++) {
+            freq[arr[i]]++;
+        }
+        //Cumulative frequency
+        for (int i = 1; i < 10; i++) {
+            freq[i] += freq[i - 1];
+        }
+        //Storing elements in result array maintaining order
+        int[] res = new int[n];
+        for (int i = n - 1; i >= 0; i--) {
+            int index = --freq[arr[i]];
+            res[index] = arr[i];
+        }
+        return res;
+    }
+	public static void main(String[] args) {
+	    int[] arr = {9, 8, 7, 5, 2, 1};
+	    int[] res = CountSort(arr, 6);
+	    for (int i: res) {
+	    System.out.print(i +" ");
+	    }
+	}
+}
\ No newline at end of file